干旱区生态环境知识资源中心(Arid): Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation

Arid

DOI	10.1130/G49067.1
	Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation
	Dietrich, Pierre; Griffis, Neil P.; Le Heron, Daniel P.; Montanez, Isabel P.; Kettler, Christoph; Robin, Cecile; Guillocheau, Francois
通讯作者	Dietrich, P (corresponding author), Univ Rennes, CNRS, Geosci Rennes, UMR 6118, F-35000 Rennes, France. ; Dietrich, P (corresponding author), Univ Johannesburg, Dept Geol, ZA-2006 Johannesburg, South Africa.
来源期刊	GEOLOGY
ISSN	0091-7613
EISSN	1943-2682
出版年	2021
卷号	49 期号:12 页码:1521-1526
英文摘要	Fjords are glacially carved estuaries that profoundly influence ice-sheet stability by draining and ablating ice. Although abundant on modern high-latitude continental shelves, fjord-network morphologies have never been identified in Earth's pre-Cenozoic glacial epochs, hindering our ability to constrain ancient ice-sheet dynamics. We show that U-shaped valleys in northwestern Namibia cut during the late Paleozoic ice age (LPIA, ca. 300 Ma), Earth's penultimate icehouse, represent intact fjord-network morphologies. This preserved glacial morphology and its sedimentary fill permit a reconstruction of paleo-ice thicknesses, glacial dynamics, and resulting glacio-isostatic adjustment. Glaciation in this region was initially characterized by an acme phase, which saw an extensive ice sheet (1.7 km thick) covering the region, followed by a waning phase characterized by 100-m-thick, topographically constrained outlet glaciers that shrank, leading to glacial demise. Our findings demonstrate that both a large ice sheet and highland glaciers existed over northwestern Namibia at different times during the LPIA. The fjords likely played a pivotal role in glacier dynamics and climate regulation, serving as hotspots for organic carbon sequestration. Aside from the present-day arid climate, northwestern Namibia exhibits a geomorphology virtually unchanged since the LPIA, permitting unique insight into this icehouse.
类型	Article
语种	英语
开放获取类型	Green Published, Bronze
收录类别	SCI-E
WOS记录号	WOS:000730017300006
WOS关键词	MARGINS ; GLACIER ; PALEOFJORD ; GREENLAND ; EROSION ; RATES
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373995
作者单位	[Dietrich, Pierre; Robin, Cecile; Guillocheau, Francois] Univ Rennes, CNRS, Geosci Rennes, UMR 6118, F-35000 Rennes, France; [Dietrich, Pierre] Univ Johannesburg, Dept Geol, ZA-2006 Johannesburg, South Africa; [Griffis, Neil P.; Montanez, Isabel P.] Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA; [Griffis, Neil P.] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA; [Le Heron, Daniel P.; Kettler, Christoph] Univ Wien, Dept Geol, Althanstr 14, A-1190 Vienna, Austria
推荐引用方式 GB/T 7714	Dietrich, Pierre,Griffis, Neil P.,Le Heron, Daniel P.,et al. Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation[J],2021,49(12):1521-1526.
APA	Dietrich, Pierre.,Griffis, Neil P..,Le Heron, Daniel P..,Montanez, Isabel P..,Kettler, Christoph.,...&Guillocheau, Francois.(2021).Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation.GEOLOGY,49(12),1521-1526.
MLA	Dietrich, Pierre,et al."Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation".GEOLOGY 49.12(2021):1521-1526.